I made a brake using the HF 20T press & air-over jack. Works well - the old "I don't need it often, but when I do, it's really nice to have".
- for the male die:
- for the female, I used 1/2" rd bars side by side (the pic is rather cluttered, sorry):
- the fence is really nice - it can be hard to align your scribed bend line with the die's edge
- the press's table & arbor were pretty loose. As a plain press that's fine, but for braking it can be a problem. I installed adjusters to keep the table and arbor aligned:
As usual, I was motivated to use the material that I had & keep it simple (e.g., there was no milling involved).
The most-needed improvement is a speed-up for the no-load travel. The press has to open wide to get the bent piece out and then close up for the next bend. It's putt-putt-putt- ... . There was a thread where Ernie modified his jack to do this.
For box bending it would be nice to have a set of long-reach male dies of various lengths. I do have one shorter die (the one in the brake1 pic). I can do a step-wise box bend (partial bend, move over, repeat), but it's tedious.
I wasn't used to building for these kind of forces and had to add reinforcing to the table and more weld generally.